Elder races

The Elder races are a group of alien species which maintained diplomatic relations at the Summeria Vspace station. From the outset they struggled for political dominance and when the station began being ripped apart by a small black hole, they factionalized themselves against "the Alliance" and the "Station Riffraff."[1]

It was stated in an interview by Blizzard employees that the zerg are universally feared, hated and hunted by all the sapient species of the Milky Way. The statement was quite general however, and it is unclear how much of it (if any) can be said to apply to the elder races.[4]

As Summeria V is based on Babylon 5, so too are the elder races likely a reference to the First Ones, from which various races sought to influence younger species.